U.S. dietary guidelines recommend fat-free or low-fat (1%) cow’s milk for adults, with a target of 3 cups per day. That said, the picture is more nuanced than it was a decade ago. Recent evidence suggests the fat content of your milk matters less than previously thought, and several non-dairy options can fill the same nutritional role if chosen carefully.
What the Official Guidelines Say
The Dietary Guidelines for Americans (2020–2025) recommend 3 cup-equivalents of dairy per day for all adults, whether you’re 25 or 75. Within that recommendation, the guidelines specify that “most choices should be fat-free or low-fat,” meaning skim or 1% milk rather than 2% or whole. Fortified soy milk is the only plant-based beverage recognized as nutritionally equivalent to dairy in the guidelines.
The American Heart Association echoes this position. Its 2026 dietary guidance statement continues to recommend nonfat or low-fat dairy products, advising people to replace major sources of saturated fat, including dairy fat, with unsaturated fat sources. The AHA suggests keeping saturated fat below 10% of your total daily calories, and choosing lower-fat milk is one straightforward way to stay under that threshold.
Does Whole Milk Actually Raise Heart Risk?
Here’s where it gets interesting. Despite the official preference for low-fat options, large-scale research paints a less clear-cut picture. A review highlighted by Harvard’s T.H. Chan School of Public Health found that dairy consumption is essentially “neutral” for cardiovascular disease risk regardless of fat content. Whole milk didn’t raise the risk of heart attack or stroke more than low-fat milk when compared with other common foods in people’s diets.
There’s an important caveat, though. Those studies typically compare dairy to foods like refined grains, processed meats, and sugary drinks. Being “neutral” in that context simply means dairy is about as healthy (or unhealthy) as the average mix of foods people eat. Research has found that swapping dairy for plant protein sources like nuts or soy was associated with lower cardiovascular risk and longer life.
The practical takeaway: if you drink one serving of milk a day, its fat content probably doesn’t make a meaningful difference for your heart. If you’re drinking several glasses daily, choosing low-fat versions reduces your overall saturated fat intake, which does lower LDL cholesterol over time.
Calcium and Bone Health After 50
Calcium needs increase as you age. Adults 19 to 50 need 1,000 mg of calcium daily. Women over 51 and men over 70 need 1,200 mg. One cup of cow’s milk provides about 300 mg, so three cups gets you close to your daily target regardless of age.
For postmenopausal women, the type of milk may matter more than the fat percentage. A year-long clinical trial of 97 postmenopausal women compared calcium-enriched milk (400 mL daily) with regular milk. The calcium-enriched group saw lumbar spine bone density increase by 2.3% at six months, and hip bone density increased by 2.2%. The regular milk group also gained bone density in the spine, but their hip density actually declined slightly over the same period. The researchers concluded that higher calcium and vitamin D intake is needed to meaningfully increase and maintain bone density and reduce hip fracture risk.
If you’re over 50 and relying on milk as a primary calcium source, look for varieties fortified with extra calcium and vitamin D. Many brands now offer these, in both full-fat and low-fat versions.
Lactose-Free Milk Is Nutritionally Identical
Roughly 68% of the world’s population has some degree of lactose malabsorption, and the discomfort it causes leads many adults to avoid milk entirely. Lactose-free milk solves this without any nutritional trade-off. Manufacturers simply add lactase, the enzyme your body would normally use to break down lactose, to regular cow’s milk. The enzyme splits lactose into two simpler sugars (glucose and galactose) before you drink it.
The result tastes slightly sweeter than regular milk but has the same protein (about 8 grams per cup), the same calcium, the same phosphorus, vitamin B12, and riboflavin. Many lactose-free varieties are also fortified with vitamin D. If you tolerate dairy but get bloating or cramping from regular milk, lactose-free is a direct swap with no nutritional downside.
How Plant-Based Milks Compare
Not all plant milks are created equal, and the differences are significant. Soy milk comes closest to cow’s milk nutritionally, with about 7 grams of protein per cup compared to dairy’s 8 grams. This is why federal guidelines single out fortified soy milk as an acceptable dairy substitute. Almond, oat, rice, and coconut milks typically contain 1 gram of protein or less per cup unless protein has been added.
Calcium is a more complicated story. Many plant milks are fortified to match dairy’s roughly 300 mg per cup, but your body doesn’t necessarily absorb all of it. Soy contains phytate, a natural compound that inhibits calcium absorption. However, the type of calcium used in fortification matters enormously. A study published in The Journal of Nutrition found that soy milk fortified with calcium carbonate had a calcium absorption rate of about 21%, virtually identical to cow’s milk at 22%. Soy milk fortified with tricalcium phosphate, on the other hand, had a lower absorption rate of about 18%. You can check which form your brand uses on the ingredient label.
One practical tip: shake your plant milk before pouring. Fortified calcium can settle at the bottom of the carton, meaning you might get very little in your glass if you pour from the top without mixing.
Choosing the Right Milk for You
Your best option depends on what you’re optimizing for. If heart health is your primary concern and you consume multiple servings of dairy daily, low-fat or skim milk reduces your saturated fat load. If you drink one glass a day and otherwise eat well, the fat content is unlikely to move the needle on cardiovascular risk.
If bone density is your priority, especially after menopause, look for milk (dairy or plant-based) that’s fortified with both calcium and vitamin D. Regular cow’s milk provides a solid baseline, but calcium-enriched versions showed measurably better results for bone density in clinical trials.
If you’re choosing plant-based milk, fortified soy is the strongest nutritional match. Other plant milks can work as part of a balanced diet, but you’ll need to get your protein and potentially your calcium from other sources. Whatever you choose, checking the nutrition label for protein content, calcium amount, added sugars, and vitamin D fortification tells you more than the front-of-package marketing ever will.